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I know this is a old post, but the TRC-450 has the 8734 PLL in it. Radio Shack had all the Uniden 8719 chassis built with the 8734 to prevent out of band operation...little did they know..
Sounds like the cut parts are a slider mod to make the clarifier change on both tx and rx. The switch in the back is either for upper or lower channels. You need a freq counter to find out where you are. As for channel 9 disabled, I don't know unless they had other channel mods there and...
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